Abstract
In the modern power system, both local and centralized reactive power control strategies for photovoltaic (PV) plants, are proposed and compared. While local control improves the network security, it lacks the optimization benefits from centralized control strategies. Therefore, this paper considers the coordination of the two control strategies, depending on external impact from the weather system and consumer behavior, in a low voltage (LV) distribution feeder. Through modeling and simulation in an established real-time cyber-physical simulation platform, the LV network is evaluated with both local and centralized control. A set of boundaries for coordinating between the two strategies are identified, which can help network operators in deciding suitable control in different operating situations. Furthermore, the cyber-physical simulation platform, is used to study the impact of physical perturbations, i.e. changes in irradiance and consumption, and cyber disturbances, in form of communication channel noise, is evaluated for the control strategies. Results show how small and large disturbances in the cyber system affects the centralized control strategy optimizer performance.
Highlights
Through governmental subsidies and a general interest in converting to renewable sources of energy, both wind and solar based generation have experienced an increased level of penetration in the power system
From a low voltage (LV) distribution network perspective, countries like Denmark have seen a rise in the integration of roof-top photovoltaic (PV) plants at residential consumers
From current literature on cyber-physical simulation platforms, the acquisition of data from real time digital simulator (RTDS) can be done through an open protocol communication (OPC) server [17, 18]
Summary
Through governmental subsidies and a general interest in converting to renewable sources of energy, both wind and solar based generation have experienced an increased level of penetration in the power system. This paper proposes an identification of boundaries in the irradianceconsumption plane of a LV radial feeder, which serve as a base for coordination of centralized and local reactive power control of residential PV plants. The intention with this coordination is to assist the network operator in the decision-making, and thereby ensure secure operation of LV networks in the cyberphysical system, without the shortcomings of each individual control strategy. The proposed coordination, considers the risk of perturbations and disturbances in the cyber-physical system It is based on extensive testing through cyber-physical modeling and real-time simulation of residential PV plants, using the Cigre European LV residential feeder as an example [12].
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